bpo-36635: Add _testinternalcapi module (GH-12841)

Add a new _testinternalcapi module to test the internal C API.

Move _Py_GetConfigsAsDict() function to the internal C API:
_testembed now uses _testinternalcapi to access the function.

3 files changed, 46 insertions, 8 deletions

diff --git a/Modules/Setup b/Modules/Setup
index 03aa0f1..e729ab8 100644
--- a/Modules/Setup
+++ b/Modules/Setup
@@ -173,6 +173,7 @@ _symtable symtablemodule.c
 #_struct _struct.c	# binary structure packing/unpacking
 #_weakref _weakref.c	# basic weak reference support
 #_testcapi _testcapimodule.c    # Python C API test module
+#_testinternalcapi _testinternalcapi.c -I$(srcdir)/Include/internal -DPy_BUILD_CORE_MODULE  # Python internal C API test module
 #_random _randommodule.c	# Random number generator
 #_elementtree -I$(srcdir)/Modules/expat -DHAVE_EXPAT_CONFIG_H -DUSE_PYEXPAT_CAPI _elementtree.c	# elementtree accelerator
 #_pickle _pickle.c	# pickle accelerator
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index ae960de..6f4eb53 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -4736,13 +4736,6 @@ decode_locale_ex(PyObject *self, PyObject *args)
 }
 
 
-static PyObject *
-get_configs(PyObject *self, PyObject *Py_UNUSED(args))
-{
-    return _Py_GetConfigsAsDict();
-}
-
-
 #ifdef Py_REF_DEBUG
 static PyObject *
 negative_refcount(PyObject *self, PyObject *Py_UNUSED(args))
@@ -4990,7 +4983,6 @@ static PyMethodDef TestMethods[] = {
     {"bad_get", (PyCFunction)(void(*)(void))bad_get, METH_FASTCALL},
     {"EncodeLocaleEx", encode_locale_ex, METH_VARARGS},
     {"DecodeLocaleEx", decode_locale_ex, METH_VARARGS},
-    {"get_configs", get_configs, METH_NOARGS},
 #ifdef Py_REF_DEBUG
     {"negative_refcount", negative_refcount, METH_NOARGS},
 #endif
diff --git a/Modules/_testinternalcapi.c b/Modules/_testinternalcapi.c
new file mode 100644
index 0000000..3a43ec1
--- /dev/null
+++ b/Modules/_testinternalcapi.c
@@ -0,0 +1,45 @@
+/*
+ * C Extension module to test Python internal C APIs (Include/internal).
+ */
+
+#if !defined(Py_BUILD_CORE_BUILTIN) && !defined(Py_BUILD_CORE_MODULE)
+#  error "Py_BUILD_CORE_BUILTIN or Py_BUILD_CORE_MODULE must be defined"
+#endif
+
+#define PY_SSIZE_T_CLEAN
+
+#include "Python.h"
+#include "pycore_coreconfig.h"
+
+
+static PyObject *
+get_configs(PyObject *self, PyObject *Py_UNUSED(args))
+{
+    return _Py_GetConfigsAsDict();
+}
+
+
+static PyMethodDef TestMethods[] = {
+    {"get_configs", get_configs, METH_NOARGS},
+    {NULL, NULL} /* sentinel */
+};
+
+
+static struct PyModuleDef _testcapimodule = {
+    PyModuleDef_HEAD_INIT,
+    "_testinternalcapi",
+    NULL,
+    -1,
+    TestMethods,
+    NULL,
+    NULL,
+    NULL,
+    NULL
+};
+
+
+PyMODINIT_FUNC
+PyInit__testinternalcapi(void)
+{
+    return PyModule_Create(&_testcapimodule);
+}